2024/07/06 by Yihang Zeng, Zeng, Yihang, Haoyu Guo +11 · 4 citations
Physics and Astronomy · #Electron #FOS: Physical sciences #Materials science #Mesoscale and Nanoscale Physics (cond-mat.mes-hall) #Physics #Quantum and electron transport phenomena #Quantum mechanics #Quantum, superfluid, helium dynamics #Statistical physics #Thermodynamics #Viscosity
paper · pdf · doi:10.48550/arxiv.2407.05026
published in arXiv (Cornell University) (Cornell University)
openalex publication_date 2024/07/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
Electron hydrodynamics is an emerging framework that describes dynamics of interacting electron systems as conventional fluids. While evidence for hydrodynamic-like transport is reported in a variety of two-dimensional materials, precise quantitative measurement of the core parameter, electron viscosity, remains challenging. In this work, we demonstrate that magnetoresistance in Corbino-shaped graphene devices offers a simultaneous Ohmmeter/viscosometer, allowing us to disentangle the individual Ohmic and viscous contributions to the transport response, even in the mixed flow regime. Most surprising, we find that in both monolayer and bilayer graphene, the effective electron-electron scattering rate scales linearly with temperature, at odds with the expected T-squared dependence expected from conventional Fermi liquid theory, but consistent with a recently identified tomographic flow regime, which was theoretically conjectured to be generic for two-dimensional charged fluids.